Powder solid cosmetic

Abstract

To provide a powder solid cosmetic having excellent impact resistance.SOLUTION: There is provided a powder solid cosmetic containing fatty acid calcium salt particles having fatty acid carbon numbers of 12 to 22, an oily component and a brilliant powder, wherein the oil component includes a polar oil having an IOB of 0.1 to 0.6, the brilliant powder has an average particle diameter of 15 to 200 μm, the fatty acid calcium salt particles have a median diameter of 4.0 to 15.0 μm, the size summary value A represented by the following expression (1) satisfies the relationship of A≤2.0 and the average thickness is 350 to 800 nm. Grain size summary value A=(D90-D10) / D50 Expression (1) (Provided, 4.0≤D50≤15.0). D10: 10% integrated diameter of calcium fatty acid salt particles on the volumes basis (μm), D50: Median diameter of fatty acid calcium salt particles on a volume basis (μm), D90: 90% integrated diameter of fatty acid calcium salt particles on the volume basis (μm).SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to powder solid cosmetics, and particularly to powder solid cosmetics having excellent impact resistance.

Background Art

[0002] Powder solid cosmetics typified by foundation and eyeshadow are manufactured by adding an oily component to powder components such as pigments and filling them into containers such as compacts. While powder solid cosmetics are excellent in portability, problems such as cracking of the molded product or falling out of the container may occur due to impacts such as vibration and dropping.

[0003] Also, as one of the methods for making the appearance of cosmetics look beautiful, it is known to blend a pearlescent powder (pearl agent). A pearlescent powder is a plate-like or spherical powder commonly used in the field of cosmetics that has an interference color, nacreous luster, or metallic luster and exhibits luster. However, blending a pearlescent powder may reduce the impact resistance of powder solid cosmetics.

[0004] In order to improve the moldability and impact resistance of powder solid cosmetics, it is known to blend metallic soap. For example, Patent Document 1 describes a solid powder cosmetic that contains metallic soap fine particles having a specific particle size and has good usability and excellent impact resistance.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, the powder solid cosmetic described in Patent Document 1 had room for improvement in terms of impact resistance. An object of the present invention is to provide a powder solid cosmetic excellent in impact resistance.

Means for Solving the Problems

[0007] As a result of intensive studies by the present inventors, it has been found that the above problems can be solved by containing specific calcium fatty acid salt particles and a specific polar oil. That is, the cosmetic according to the present invention is as follows. <1>A powder solid cosmetic containing calcium fatty acid salt particles having 12 to 22 carbon atoms in the fatty acid, an oily component, and a glitter powder, wherein the oily component contains a polar oil having an IOB of 0.1 to 0.6, the glitter powder has an average particle size of 15 to 200 μm, the calcium fatty acid salt particles have a median diameter of 4.0 to 15.0 μm, satisfy the relationship of the particle size summary value A represented by the following formula (1) of A ≦ 2.0, and have a thickness average of 350 to 800 nm, a powder solid cosmetic. Particle size summary value A = (D90 - D10) / D50 ··· formula (1) (However, 4.0 ≦ D50 ≦ 15.0) D10: 10% integrated diameter (μm) based on the volume of calcium fatty acid salt particles D50: Median diameter (μm) based on the volume of calcium fatty acid salt particles D90: 90% integrated diameter (μm) based on the volume of calcium fatty acid salt particles <2>The powder solid cosmetic according to <1>, wherein the content of the glitter powder is 30% by mass or more. <3>The powder solid cosmetic according to <1> or <2>, which is decorated with an uneven shape on the surface.

Effects of the Invention

[0008] [[ID=�5]] According to the present invention, a powder solid cosmetic excellent in impact resistance can be provided.

Mode for Carrying Out the Invention

[0009] The cosmetic of the present invention contains specific calcium fatty acid salt particles as a metallic soap. The calcium fatty acid salt particles in the present invention have 12 to 22 carbon atoms in the fatty acid. By having 12 or more carbon atoms in the fatty acid, excellent usability in cosmetics can be imparted. On the other hand, by having 22 or less carbon atoms, the fatty acid is industrially easy to obtain and has high productivity. The carbon number of the fatty acid is preferably 12 to 18 from the viewpoint of impact resistance, and more preferably 14 (that is, the calcium fatty acid salt is calcium myristate). Moreover, the fatty acid is not particularly limited as long as it is a fatty acid having 12 to 22 carbon atoms. That is, it may be either a naturally derived fatty acid or a synthetic fatty acid, either a saturated fatty acid or an unsaturated fatty acid, and either a linear or branched fatty acid. Furthermore, a functional group such as a hydroxyl group, an aldehyde group, or an epoxy group may be contained in the structure of the fatty acid. A linear saturated fatty acid is preferred as the fatty acid.

[0010] Examples of the fatty acid include lauric acid, myristic acid, myristoleic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, linoleic acid, arachidic acid, behenic acid, erucic acid, hydroxystearic acid, and epoxy stearic acid. Among them, myristic acid is preferred. When using a mixed fatty acid, the myristic acid content in the fatty acid is preferably 50% or more, more preferably 60% or more, and even more preferably 70% or more.

[0011] The calcium fatty acid salt particles in the present invention have a median diameter (D50) of 4.0 to 15.0 μm on a volume basis. By having such a particle diameter, excellent impact resistance is achieved. The median diameter of the calcium fatty acid salt particles is preferably 5.0 to 12.0 μm, and more preferably 6.0 to 10.0 μm. The particle diameter can be measured by the Microtrac laser diffraction method in the same manner as the particle size summary value A described later.

[0012] The calcium fatty acid salt particles in the present invention satisfy the relationship of A ≤ 2.0 for the particle size summary value A represented by the following formula (1). Particle size summary value A = (D90 - D10) / D50 ··· formula (1) (However, 4.0 ≦ D50 ≦ 15.0) D10: 10% cumulative diameter (μm) of calcium fatty acid salt particles based on volume standard D50: Median diameter (μm) of calcium fatty acid salt particles based on volume standard D90: 90% cumulative diameter (μm) of calcium fatty acid salt particles based on volume standard Due to the narrow particle size distribution of the calcium fatty acid salt particles, they can be uniformly present in the cosmetic, and it is easy to exhibit impact resistance.

[0013] In the present invention, the particle size summary value A is calculated from the particle diameter measured by the Microtrac laser diffraction method. When the particle size summary value A is 2.0 or less, the particle diameters of the calcium fatty acid salt particles present in the cosmetic become uniform, the dispersibility of the cosmetic is good, the productivity does not decrease, and a cosmetic having the desired feel can be manufactured. It is more preferable that the particle size summary value A satisfies the relationship of 0.5 ≦ A ≦ 1.8. When the relationship of 0.5 ≦ A ≦ 1.8 is satisfied, the action and effect of the present invention can be obtained more stably. If the particle size summary value A is 0.5 or more, the yield does not decrease and it can be stably manufactured industrially. In addition, when the cumulative curve is obtained with the total volume of the powder population as 100% in the above formula (1), the particle diameters at the points where the cumulative curve becomes 10%, 50%, and 90% are defined as the 10% cumulative diameter (D10), 50% median diameter (D50; median diameter), and 90% cumulative diameter (D90) (μm), respectively. In addition, the adjustment of the particle size summary value A can be performed by appropriately adjusting the concentration of the fatty acid alkali compound salt, the temperature during the reaction of the fatty acid alkali compound salt and the calcium salt, and the dropping rate when the calcium salt-containing aqueous solution is dropped into the fatty acid alkali compound salt-containing aqueous solution in the method for producing calcium fatty acid salt particles described below. Also, for those with a wide particle size distribution, that is, those with a large value of the particle size summary value A, it can be adjusted by classification using sieves such as 100 mesh, 200 mesh, and 330 mesh in the post-treatment.

[0014] The microtrack laser diffraction method used here is a method for obtaining a particle size distribution by utilizing the scattered light obtained by irradiating laser light onto particles. In the present invention, a wet measurement is performed in which a sample is directly introduced into an organic solvent in which calcium fatty acid salt particles do not dissolve, such as ethanol or isopropyl alcohol, while circulating the organic solvent. Further, the measurement target in the present invention is in the range of 0.1 μm to 200 μm in particle diameter, and the value represented by the above formula (1) is defined as the particle size summary value A. In the present invention, for example, it can be measured using Microtrac MT-3000 manufactured by Nikkiso Co., Ltd.

[0015] The calcium fatty acid salt particles in the present invention have a thickness average of 350 to 800 nm. With such a thickness, it becomes easier to dissolve even under mild mixing conditions (manufacturing method) in cosmetics, and it becomes easier to uniformly apply to the skin as a cosmetic, and the feel after application can also be improved. Furthermore, with such a thickness, the impact resistance is sufficient when added to cosmetics. The thickness average of the particles is more preferably 400 to 700 nm. If the range of 400 to 700 nm is satisfied, the action and effect of the present invention can be obtained more stably. Note that the thickness of the particle is the value of the length of the side surface when the surface with the largest area in the calcium fatty acid salt particle is taken as the front surface.

[0016] The calcium fatty acid salt particles having the above specific thickness will be described later in the explanation of the manufacturing method. When mixing an aqueous solution containing a calcium salt and an aqueous solution containing a fatty acid alkali compound salt separately prepared by a double decomposition reaction, the aqueous solution containing the calcium salt is gradually dropped into the aqueous solution containing the fatty acid alkali compound salt at an appropriate rate, whereby the particles can be obtained.

[0017] Also, the shape of the calcium fatty acid salt particles in the present invention is not particularly limited, but is preferably plate-like.

[0018] The powder solid cosmetic of the present invention contains calcium fatty acid salt particles having the above specific properties, and thus has excellent impact resistance. This is presumably because the particle size summary value A of the calcium fatty acid salt particles satisfies the relationship of A ≦ 2.0, that is, the particle size distribution of the calcium fatty acid salt particles is narrow, so the dispersibility is good and they are uniformly distributed in the molded body, resulting in less distortion bias when an impact is applied and easier stress relaxation throughout the bulk. As a result, it is considered that the calcium fatty acid salt particles uniformly dispersed in the molded body can firmly adhere the powders to each other and disperse the impact stress, improving the impact resistance.

[0019] From the viewpoint of impact resistance, the content of the calcium fatty acid salt particles in the powder solid cosmetic of the present invention is preferably 0.01 to 30% by mass, more preferably 0.1 to 20% by mass, and particularly preferably 1 to 10% by mass.

[0020] The above-specified calcium fatty acid salt particles can be prepared by a metathesis method in which a fatty acid alkali compound salt obtained by reacting a monovalent alkali compound with a fatty acid having 12 to 22 carbon atoms is reacted with a divalent calcium salt in an aqueous solution.

[0021] Examples of the monovalent alkali compound used as a raw material for the fatty acid alkali compound salt include hydroxides of alkali metals (such as sodium and potassium), and amines such as ammonia, monoethanolamine, diethanolamine, and triethanolamine. From the viewpoint of high solubility in water when used as the fatty acid alkali compound salt, hydroxides of alkali metals such as sodium and potassium are preferred.

[0022] The fatty acid alkali compound salt used in the present invention is generally obtained by reacting a monovalent alkali compound with a fatty acid at a temperature equal to or higher than the melting point of the fatty acid and at which the fatty acid does not decompose, preferably 100°C or lower, more preferably 50 to 100°C, still more preferably 60 to 95°C, and particularly preferably 70 to 95°C.

[0023] The calcium fatty acid salt particles of the present invention can be obtained, for example, by reacting the fatty acid alkali compound salt obtained above with a calcium salt in an aqueous solution. The calcium salt is specifically a salt of an inorganic calcium and an inorganic acid or an organic acid. Examples of the calcium salt include calcium chloride, calcium acetate, etc. In particular, calcium chloride is preferable because of its high solubility in water and its efficient reaction with the fatty acid alkali compound salt.

[0024] The reaction between the fatty acid alkali compound salt and the divalent calcium salt is specifically carried out by separately preparing an aqueous solution containing the calcium salt and an aqueous solution containing the fatty acid alkali compound salt, and then mixing them. For example, it is carried out by adding the aqueous solution containing the calcium salt to the aqueous solution containing the fatty acid alkali compound salt, or by adding both to another reaction tank.

[0025] When mixing the aqueous solution containing the fatty acid alkali compound salt and the aqueous solution containing the calcium salt, if the aqueous solution containing the calcium salt is charged all at once into the aqueous solution containing the fatty acid alkali compound salt, for example, the shape of the obtained calcium fatty acid salt particles may become non-uniform and the particle size distribution may become wide. Therefore, in the present invention, it is preferable to gradually drop the aqueous solution containing the calcium salt into the aqueous solution containing the fatty acid alkali compound salt at an appropriate rate. The dropping rate is preferably 0.005 to 0.8 mol / mol per unit time, and more preferably 0.01 to 0.5 mol / mol. By mixing at such a dropping rate, the exchange reaction between the alkali and calcium can proceed gently, and calcium fatty acid salt particles having an appropriate thickness can be obtained. When this rate is 0.005 mol / mol or more, the thickness of the particles does not become thin, and calcium fatty acid salt particles having a desired thickness can be obtained. On the other hand, when the dropping rate per unit time is 0.8 mol / mol or less, the shape of the calcium fatty acid salt particles becomes uniform, and since the particles have a desired thickness, the particle size is also not uneven and is good. Note that the unit "mol / mol" of the calcium salt to be dropped is the number of moles of the calcium salt to be dropped relative to 1 mol of the fatty acid alkali compound.

[0026] When producing the calcium salt of fatty acid, the concentration of the alkali compound salt of fatty acid is usually 1% to 20% by mass, preferably 5% to 15% by mass, from the viewpoints of the productivity of the calcium salt of fatty acid and the handleability of the aqueous solution containing the alkali compound salt of fatty acid or the obtained calcium salt of fatty acid slurry. If the concentration of the alkali compound salt of fatty acid is 1% by mass or more, the productivity of the calcium salt of fatty acid is good and preferable. If it is 20% by mass or less, the viscosity of the aqueous solution containing the alkali compound salt of fatty acid or the obtained calcium salt of fatty acid slurry does not increase, and a uniform reaction can be carried out. Incidentally, the concentration of the calcium salt in the calcium salt-containing liquid is usually 10% to 50% by mass, preferably 10% to 40% by mass, from the viewpoints of the productivity of the calcium salt of fatty acid and the handleability of the aqueous solution containing the alkali compound salt of fatty acid or the obtained calcium salt of fatty acid slurry.

[0027] The reaction between the alkali compound salt of fatty acid and the calcium salt is carried out under the temperature conditions usually carried out by those skilled in the art in consideration of the solubility of the alkali compound salt of fatty acid. Preferably it is 50 to 100 °C, more preferably 60 to 95 °C. If the reaction temperature is 50 °C or more, the reaction rate between the alkali compound salt of fatty acid and the calcium salt is good.

[0028] For the purpose of stabilizing the calcium salt of fatty acid slurry during the reaction between the alkali compound salt of fatty acid and the calcium salt and improving the productivity of the calcium salt of fatty acid, it is preferable to present a polyalkylene glycol-based ether, particularly a triblock ether having a structure in which an oxypropylene block is sandwiched by oxyethylene blocks (EO-PO-EO), in the calcium salt of fatty acid slurry. The content of the polyalkylene glycol-based ether in the calcium salt of fatty acid slurry is usually 0.01 part to 5 parts by mass, preferably 0.05 part to 2 parts by mass, based on 100 parts by mass of the alkali compound salt of fatty acid. Incidentally, the polyalkylene glycol-based ether may be present in the reaction system before reacting the monovalent alkali compound and the fatty acid, or may be present in the reaction system before the reaction between the alkali compound salt of fatty acid and the calcium salt.

[0029] By this method, a calcium fatty acid salt cake with reduced moisture content is obtained by separation using a dehydrator, a filter press, etc. The calcium fatty acid salt cake with reduced moisture content is dried using a rotary dryer, a pneumatic dryer, a through-air shelf dryer, a spray dryer, a fluidized bed dryer, etc.

[0030] In the present invention, the drying of the calcium fatty acid salt cake needs to be carried out at (α - 40)°C ≤ α ≤ (α + 5)°C with respect to the water evaporation peak top temperature (α°C) of the generated calcium fatty acid salt. Here, the water evaporation peak top temperature is the top peak of the temperature range where the residual water that cannot be removed by the above drying contained in the calcium fatty acid salt begins to desorb. For example, in the heat absorption graph by differential scanning calorimetry (DSC) of calcium myristate, the water evaporation peak top temperature is 110.3°C. The specific drying temperature varies depending on the type of the obtained calcium fatty acid salt. For example, in the case of calcium myristate, it is 115°C or lower. When drying is carried out at a temperature higher than 115°C, agglomeration of fine particles occurs and the particle thickness tends to increase. On the other hand, when drying is carried out at a temperature lower than 70°C, the drying property deteriorates and a large amount of moisture remains in the compound. By the above method, calcium fatty acid salt particles are obtained.

[0031] The powder solid cosmetic of the present invention contains an oily component from the viewpoints of impact resistance and moldability. The content of the oily component in the powder solid cosmetic is preferably 5 to 30% by mass. Examples of the oily component include liquid oil and solid oil. The liquid oil contains a polar oil from the viewpoints of impact resistance and moldability. The IOB of the polar oil is 0.01 or more, preferably 0.1 or more. By containing such a polar oil together with the above calcium fatty acid salt particles, the impact resistance of the cosmetic is improved. Also, the IOB of the polar oil is preferably 0.6 or less from the viewpoint of impact resistance. The content of the polar oil is preferably 20% by weight or more, more preferably 30% by mass or more, based on the total amount of the oily components, from the viewpoint of impact resistance, and is preferably 95% by mass or less, more preferably 90% by mass or less, from the viewpoint of caking.

[0032] Examples of polar oils with an IOB of 0.01 or more include oleic acid (IOB value = 0.42), isostearic acid (IOB value = 0.43), isopropyl myristate (IOB value = 0.18), octyl palmitate (IOB value = 0.13), isopropyl palmitate (IOB value = 0.16), butyl stearate (IOB value = 0.14), hexyl laurate (IOB value = 0.17), myristyl myristate (IOB value = 0.11), decyl oleate (IOB value = 0.11), isononyl isononanoate (IOB value = 0.20), isotridecyl isononanoate (IOB value = 0.15), cetyl ethylhexanoate (IOB value = 0.13), glycol distearate (IOB value = 0.16), glyceryl diisostearate (IOB value = 0.29), neopentyl glycol dicaprate (IOB value = 0.25), diisostearyl malate (IOB value = 0.28), trimethylolpropane triisostearate (IOB value = 0.16), glyceryl tri(2-ethylhexanoate) (triethylhexanoin) (IOB value = 0.35), trimethylolpropane trioctanoate (IOB value = 0.33), trimethylolpropane triisostearate (IOB value = 0.16), diisobutyl adipate (IOB value = 0.46), N-lauroyl-L-glutamic acid 2-octyldodecyl ester (IOB value = 0.29), 2-hexyldecyl adipate (IOB value = 0.16), diisopropyl sebacate (IOB value = 0.40), ethylhexyl methoxycinnamate (IOB value = 0.28), olive oil (IOB value = 0.16), castor oil (IOB value = 0.43), decyltetradecanol (IOB value = 0.21), octyldodecanol (IOB value = 0.26), oleyl alcohol (IOB value = 0.28), etc. In addition, as the liquid oil component other than the above polar oil, other liquid oily components such as hydrocarbon oil may be combined and used within a range that does not impair the effects of the present invention.

[0033] In addition, the powdered solid cosmetic of the present invention may contain a solid oil component as an oily component as long as the effects of the present invention are not impaired. The solid oil component is not particularly limited as long as it can be blended into cosmetics. Specific examples of the solid oil component include hydrocarbon, wax, and waxes such as solid paraffin, ceresin, microcrystalline wax, polyethylene wax, hardened oil, beeswax, candelilla wax, carnauba wax, etc., higher fatty acids such as stearic acid, lauric acid, myristic acid, behenic acid, etc., and higher alcohols such as cetyl alcohol, stearyl alcohol, lauryl alcohol, etc.

[0034] The powdered solid cosmetic of the present invention preferably contains a pearlescent powder (pearl agent) from the viewpoint of imparting beautiful luster. From the same viewpoint, the content of the pearlescent powder is 30% by mass or more, preferably 40% by mass or more, more preferably 50% by mass or more. Also, from the viewpoint of impact resistance, it is preferably 90% by mass or less. Since the powdered solid cosmetic of the present invention is excellent in impact resistance, a large amount of the pearlescent powder can be blended.

[0035] From the viewpoint of imparting high luster, the powdered solid cosmetic of the present invention preferably contains a pearlescent powder having an average particle size (median diameter) of preferably 15 to 200 μm, more preferably 20 to 200 μm, still more preferably 25 to 200 μm, and particularly preferably 50 to 200 μm as the pearlescent powder.

[0036] As the glitter powder, plate-like or spherical powders having an interference color, nacreous luster, or metallic luster and exhibiting luster, which are usually used in cosmetics, can be used. For example, mica titanium, iron oxide-coated mica titanium, carmine-coated mica titanium, carmine - congo red-coated mica titanium, iron oxide - carmine-treated mica titanium, congo red-treated mica titanium, iron oxide - congo red-treated mica titanium, chromium oxide-treated mica titanium, black titanium oxide-treated mica titanium, acrylic resin-coated aluminum powder, silica-coated aluminum powder, titanium oxide-coated mica, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, colored titanium oxide-coated mica, titanium oxide-coated synthetic mica, titanium oxide-coated silica, titanium oxide-coated alumina, titanium oxide-coated glass flake, polyethylene terephthalate - polymethyl methacrylate laminated film powder, bismuth oxychloride, fish scale foil, etc. can be mentioned.

[0037] The powder solid cosmetic of the present invention may further contain inorganic powders and organic powders. Examples of the inorganic powders include inorganic pigments such as titanium oxide, zinc oxide, red iron oxide, yellow iron oxide, and black iron oxide, mica, talc, etc. Examples of the organic powders include organic pigments such as natural dyes. Further, these powders may be surface-treated with fluorine compounds, silicone-based compounds, fatty acids, etc.

[0038] In addition to the above components, the powder solid cosmetic of the present invention can be appropriately blended with other components usually used in cosmetics, etc., within a range not impairing the effects of the present invention. Examples of the other components include surfactants, humectants, polymers, dyes, lower alcohols, polyhydric alcohols, antioxidants, ultraviolet absorbers, beauty components, antibacterial agents, preservatives, pH adjusters, fragrances, etc.

[0039] Since the powder solid cosmetic of the present invention is excellent in impact resistance, it is suitable as a cosmetic having a decorative uneven shape such as a pattern or characters on the surface of the cosmetic.

[0040] Examples of the uses of the powder solid cosmetic of the present invention include makeup cosmetics such as foundation, concealer, face powder, control color, eye shadow, eyeliner, cheek color, body powder, perfume powder, baby powder, and the like.

Example

[0041] The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. Unless otherwise specified, the blending amount is shown as mass% with respect to the system in which the component is blended.

[0042] <Evaluation of calcium myristate particles> Regarding calcium myristate particles, the median diameter, particle size summary value A [value calculated from the 10% integrated diameter D10 (μm) based on volume, the median diameter D50 (μm) based on volume, and the 90% integrated diameter D90 (μm) based on volume], and the thickness of the particles were measured by the above-described method using the following apparatuses, respectively.

[0043] (1) Particle size summary value A, median diameter 2.0 g of the sample was collected in a 100 ml glass beaker, 3 to 5 ml of a nonionic surfactant (e.g., Nonion NS-210 manufactured by NOF Corporation) was dropped, and the mixture was kneaded with a spatula. Then, 20 ml of purified water was added and dispersed by ultrasonic waves to make 100 ml of a measurement sample. The sample was supplied to a particle size distribution measuring apparatus (equipment name: Microtrac MT-3000, manufactured by Nikkiso Co., Ltd.) for measurement (principle: laser diffraction / scattering method). When a cumulative curve was obtained with the total volume of the population of the powder to be measured as 100%, the particle diameters at the points where the cumulative curve was 10%, 50%, and 90% were determined as the 10% diameter (D10), 50% diameter (D50; median diameter), and 90% diameter (D90) (μm), respectively. The particle size summary value A was determined from the obtained D10, D50, and D90.

[0044] (2) Thickness of particles The thickness of the particles was measured by the following method using a scanning electron microscope. After adhering the particles to a carbon double-sided tape, a sample in which the particle surface was coated with platinum particles by vapor deposition was observed at an acceleration voltage of 1.0 kV and a magnification of 2000 times, and the thickness was measured for arbitrary particles.

[0045] <Preparation of Calcium Myristate Particles> Calcium myristate particles with a median diameter (D50) = 6.7 μm, D10 = 4.1 μm, D90 = 11.0 μm, particle size summary value A = 1.0, and an average particle thickness of 596 nm were prepared by the following method. 250 g of myristic acid (NAA-142 manufactured by NOF Corporation), 1.25 g of polyethylene glycol-polypropylene glycol-block ether (manufactured by NOF Corporation, trade name: Pronon #104), and 2500 g of water were charged into a 3 L separable flask, and the temperature was raised to 90°C. Next, 87.0 g of a 48 mass% aqueous sodium hydroxide solution was added, and the mixture was stirred at the same temperature (90°C) for 1 hour to obtain an aqueous sodium myristate salt solution. Then, while maintaining the temperature at 90°C, 174.5 g of a 35 mass% aqueous calcium chloride solution was added dropwise to the aqueous sodium myristate salt solution over 30 minutes [dropwise addition rate: 0.39 (mol / mol)]. After completion of the dropwise addition, the mixture was maintained at 90°C and stirred for 10 minutes for aging. 1500 g of water was added to the obtained aqueous slurry of mixed fatty acid calcium salt, and the mixture was cooled to 65°C or lower. Then, it was filtered with a suction filter, washed twice with 1000 g of water, and the obtained cake was dried at 80°C using a through-air shelf dryer and crushed with a mill to obtain calcium myristate salt particles.

[0046] <Magnesium Myristate> For comparison, magnesium myristate with a median diameter of 17 μm (manufactured by Taihei Chemical Industry Co., Ltd.) was prepared.

[0047] <Mica> For comparison, mica with a median diameter of 20 μm was prepared.

[0048] <Examples 1 to 4, Comparative Examples 1 to 7: Eye Shadow> The eye shadow having the composition shown in Table 1 was prepared according to the following production method. Production method: Using a Henschel mixer (registered trademark), the powder components and the bright powder were stirred with the mixer to obtain Part A. The oily component as a binder etc. was heated while stirring to obtain Part B which was dissolved. Thereafter, while stirring Part A, Part B was gradually added to obtain Part C. A volatile solvent was added to Part C, and wet mixing was performed to make it into a slurry by stirring. The slurry was filled into a container and the solvent was removed through a vacuum suction and drying process, and wet molding was performed to solidify the powder.

[0049] <Evaluation method> Impact resistance: Three cosmetic test specimens of the examples and comparative examples were dropped from a height of 30 cm. For the test specimens after dropping, the number of drops until cracks, fissures, cracks, peeling, etc. occurred was measured. The minimum number of times for each test specimen was listed in Table 1. If it was 30 times or more, it was considered that the impact resistance was good.

[0050]

Table 1

[0051] As shown in Table 1, all of the eye shadows of the examples containing specific calcium myristate particles and a polar oil of specific IOB were excellent in impact resistance and had good hardness while having a high content of bright powder. On the other hand, good impact resistance could not be obtained for the eye shadows of the comparative examples.

[0052] <Examples 5 to 6, Comparative Examples 8 to 10: Eye shadow> Eye shadow was produced in the same manner as in Example 1 except that the composition shown in Table 2 was used, and the impact resistance was evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0053]

Table 2

[0054] As shown in Table 2, all of the eye shadows of the examples containing specific calcium myristate particles and a specific polar oil of IOB were excellent in impact resistance while having a high content of the phosphorescent powder. On the other hand, good impact resistance could not be obtained for the eye shadows of the comparative examples.

Claims

1. A powder solid cosmetic comprising calcium fatty acid salt particles having 12 to 22 carbon atoms in the fatty acid, an oily component, and a glitter powder, wherein the oily component contains a polar oil having an IOB of 0.1 to 0.6, the glitter powder has an average particle size of 15 to 200 μm, the calcium fatty acid salt particles have a median diameter of 4.0 to 15.0 μm, satisfy the relationship of the particle size summary value A represented by the following formula (1) of A ≦ 2.0, and have a thickness average of 350 to 800 nm, a powder solid cosmetic. Particle size summary value A = (D90 - D10) / D50... Formula (1) (However, 4.0 ≦ D50 ≦ 15.0) D10: 10% integrated diameter (μm) based on the volume of calcium fatty acid salt particles D50: Median diameter (μm) based on the volume of calcium fatty acid salt particles D90: 90% integrated diameter (μm) based on the volume of calcium fatty acid salt particles

2. The powder solid cosmetic according to claim 1, wherein the content of the glitter powder is 30% by mass or more.

3. The powder solid cosmetic according to claim 1 or 2, which is decorated with an uneven shape on the surface.

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